Question

Find the current and power consumed by an electric iron having 80 ohm resistance when feed from a 220 volt supply

Answer 1

ɢɪᴠᴇɴ :-

• Resistance (R) = 80 Ω
• Potential Difference (V) = 220 V

ᴛᴏ ғɪɴᴅ :-

• Current (I)
• Power consumed (P)

sᴏʟᴜᴛɪᴏɴ :-

✞ According to Ohm's Law , we get,

➦ Potential Difference = Current × Resistance

➭ V = I × R

➭ 220 = I × 80

➭ I = 220/80

➭ I = 2.75 Amperes (A)

Hence,

• Current(I) = 2.75 Amperes (A)

Now,

We know that,

➦ Power consumed = Potential Difference × Current

➭ P = V × I

➭ P = 220 × 2.75

➭ P = 605 Watt (W)

Hence,

• Current(I) = 2.75 A
• Power(P) = 605 Watt

Answer 2

Given:

• Potential difference, V = 220 volt

• Resistance, R = 80 ohm

To be calculated:

Calculate the current and power consumed by a electric iron ?

Formula used:

• I = V/R

• P = I²R, V²/R, VI

Solution:

Case 1 :

We know that,

I = V/R

★ Substituting the values of potential difference and resistance in the above formula,we get

I = 220/80

I = 22/8

Current, I = 2.75 Ampere

Case 2 :

We know that,

P = I²R

= 2.75² × 80

= 2.75 × 2.75 × 80

= 605 watt

OR

P = V²/R

= (220)² / 8

= 48400 / 8

= 605 watt

OR

P = VI

= 220 × 2.75

= 605 watt